Plasmonic Properties of Colloidal Assemblies

Roßner, Christian; König, Tobias; Fery, Andreas

doi:10.1002/adom.202001869

Cited by 32 publications

(28 citation statements)

References 121 publications

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“…[1,16,[18][19][20] Capillary-assisted, electrophoretic, and templated self-assembly can be used to generate nanoparticle arrays from colloidal building blocks, offering affordable alternatives to top-down electron beam lithography, focused ion beam lithography, and electro-and thermal deposition. [18,20,21] Despite these advantages, beginning from colloidal suspensions often involves multistep, time-consuming processes that limit scalability. For instance, liters-scale batch presynthesis requires precise temperature and additional rate control and ligand exchange requires the addition of large excesses of capping ligands and multiple centrifugation steps.…”

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confidence: 99%

Surface Lattice Plasmon Resonances by Direct In Situ Substrate Growth of Gold Nanoparticles in Ordered Arrays

et al. 2022

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frequencies of light depending on the nanoparticle size, shape, material, and local dielectric environment. [1] This localized surface plasmon resonance (LSPR) effect can confine light in subwavelength volumes, [2] resulting in the generation of an enhanced electric field. However, these resonances are typically short lived, due to intrinsic high radiative optical losses that limit the associated quality factors (<10). [3] Nonetheless, arranging plasmonic nanoparticles into ordered arrays emerged as a convenient strategy to overcome this limitation and to boost the quality factors of the system. In this configuration the optical losses associated with LSPRs can be compensated under Bragg conditions by hybridization with the scattered waves in the plane of the array close to the position of the Rayleigh-Wood anomalies. [3] This compensation generates lattice plasmon resonances, and offers an additional possibility for tuning the optical properties, depending on the angle of illumination and the geometrical parameters of the array. [3] Due to their narrow bandwidth (<2 nm) and long lifetimes, [3][4][5] lattice plasmon resonances already impact the enhancement and manipulation of light-matter interactions, [6][7][8] sensing, [9][10][11][12] displays, [13] information storage [14] and anti-reflective materials. [15] The development of a simple, scalable, and rapid technique that combines the benefits of top-down and bottom-up methods Precise arrangements of plasmonic nanoparticles on substrates are important for designing optoelectronics, sensors and metamaterials with rational electronic, optical and magnetic properties. Bottom-up synthesis offers unmatched control over morphology and optical response of individual plasmonic building blocks. Usually, the incorporation of nanoparticles made by bottom-up wet chemistry starts from batch synthesis of colloids, which requires time-consuming and hard-to-scale steps like ligand exchange and self-assembly. Herein, an unconventional bottom-up wet-chemical synthetic approach for producing gold nanoparticle ordered arrays is developed. Water-processable hydroxypropyl cellulose stencils facilitate the patterning of a reductant chemical ink on which nanoparticle growth selectively occurs. Arrays exhibiting lattice plasmon resonances in the visible region and near infrared (quality factors of >20) are produced following a rapid synthetic step (<10 min), all without cleanroom fabrication, specialized equipment, or selfassembly, constituting a major step forward in establishing in situ growth approaches. Further, the technical capabilities of this method through modulation of the particle size, shape, and array spacings directly on the substrate are demonstrated. Ultimately, establishing a fundamental understanding of in situ growth has the potential to inform the fabrication of plasmonic materials; opening the door for in situ growth fabrication of waveguides, lasing platforms, and plasmonic sensors.

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Surface Lattice Plasmon Resonances by Direct In Situ Substrate Growth of Gold Nanoparticles in Ordered Arrays

et al. 2022

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“…In the current state, the learning platform offers the potential for further development and content enrichment from optics, chemistry, didactics, and multimedia communication. The already existing chemical synthesis protocols, well-adapted for the high school and university students, can be complemented by the suggested platform to illustrate and predict the absorption and scattering effects caused by using different materials or producing particles not only in spherical but also in more complex, for instance, star-like shapes. ,,,− The platform also has the potential to interpret the concepts of the current research in a game-like format, e.g., through arranging several nanoparticles into chains and introducing the plasmonic coupling. , Finally, the concept of this plasmonic teaching platform can be extended to other nanotechnology topics and promote the awareness of this promptly developing field.…”

Section: Discussionmentioning

confidence: 99%

“…6,10,23,25−27 The platform also has the potential to interpret the concepts of the current research in a game-like format, e.g., through arranging several nanoparticles into chains and introducing the plasmonic coupling. 28,29 Finally, the concept of this plasmonic teaching platform can be extended to other nanotechnology topics and promote the awareness of this promptly developing field.…”

Section: ■ Conclusionmentioning

confidence: 99%

Development of a Teaching Platform about Plasmonics Based on the Color Perception of Colloidal Gold

et al. 2021

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In contrast to a macroscopic solid, the color and spectroscopic properties of gold nanoparticles change with size. Here, we propose a teaching platform for high school students (hereafter defined as students, attending secondary school in Europe, preparatory high schools in the US, or any educational institution of a comparable level) that explains the relationship between the perceived color of colloidal solutions and their physicochemical properties. For this aim, an open-source code, based on Mie theory and colorimetry, was developed to link the perceived colors to the plasmonic effects. Moreover, a set of such nanoparticles, varied in diameter, was created to support the theoretical description. The employed seed-mediated synthesis approach provides sufficient spherical roundness that is crucial for color matching. The proposed teaching platform is available online and can be linked to an outreach activity or practical laboratory course. Furthermore, we illustrate the linkage of nanoscience concepts to real-world examples (e.g., stained church glass), which can be used for promoting the potential of nanotechnology in other fields, including electronics, optics, and biomedicine adding to the interdisciplinarity of the teaching platform.

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“…For instance, we show a pH-responsive polymer coating on plasmonic nanoparticles, which can be used as a model system to understand the self-assembly process as well as the pH sensor. We envision that this method will open a plethora of new designs of core–shell nanoparticles with different applications. , …”

Section: Discussionmentioning

confidence: 99%

A General Nanocoating Method via Photoinduced Self-Initiation

Deng

Lü

et al. 2021

Langmuir

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Hybrid core–shell nanoparticles play a very significant role in many applications. Here, we report a light-induced oligomer coating on nanoparticles via Norrish type I reaction. The radical species generated via UV irradiation can chemically initiate the photoinitiators, which are then polymerized and deposited on inorganic nanoparticles via heterogeneous nucleation, forming a soft oligomer coating smaller than 40 nm. This coating method is versatile and potentially applicable to many different types of inorganic cores and their assemblies, making it a very useful technique for “freezing” nanoassemblies in solution. Moreover, these oligomer coatings containing radical species can also initiate surface polymerization of both styrenic and acrylic monomers with certain functionalities for different applications such as self-assembly, plasmon tuning, and pH sensing (3.5–4.5).

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Plasmonic Properties of Colloidal Assemblies

Cited by 32 publications

References 121 publications

Surface Lattice Plasmon Resonances by Direct In Situ Substrate Growth of Gold Nanoparticles in Ordered Arrays

Surface Lattice Plasmon Resonances by Direct In Situ Substrate Growth of Gold Nanoparticles in Ordered Arrays

Development of a Teaching Platform about Plasmonics Based on the Color Perception of Colloidal Gold

A General Nanocoating Method via Photoinduced Self-Initiation

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